Explain call by reference, C/C++ Programming

Assignment Help:

Call by Reference

Passing variables(parameters) to a function in C can be done in two ways - pass by value, also called as call by value and pass by address or also known as call by address. C++ though , gives one more way to call a function - call by reference. In call by value , a copy of the actual contents of the variables is passed to the function. In this case, alters made to the formal variable , as they are called, are not reflected back in the calling function. Passing an address permits changes to be made directly to the memory, which are occupied by the actual variable.

Though, a call by address requires the formal variable to be considered as pointer and therefore the indirection operator has to be used with them. A reference on the other hand, is another name, for a previously explained variable. In other words, after a reference is explained for a particular variable, using its original name as well as the reference can refer to the variable. Hence, a reference is nothing but an alias.

 Thus not passing a copy (call by value) saves time and is efficient. It does not have to make a temporary variable /. And not passing the address(call by address), eliminates the use of pointers in the called functions. But, at the same time, the changes made to a formal variable , using its reference or alias can be reflected back in the calling function.

 


Related Discussions:- Explain call by reference

Give advantage of using nfs, Question: a) Give two uses of NFS. b) G...

Question: a) Give two uses of NFS. b) Give one advantage of using NFS. c) Explain the following lines as they would be interpreted in the /etc/exports file i. /usr/local

Program to define an array in c, Program to define an array in c: Writ...

Program to define an array in c: Write a program to define an array and print the value of array. void main() { int a[10]={0,11,21,34,44,75,46,57,88,89},i,j,k; clr

How does c++ help with the tradeoff of security vs.usability, A: In C, enca...

A: In C, encapsulation was completed by making things static in a compilation unit or module. It prevented another module from accessing the static stuff. (Incidentally, now static

Need help, how to make basics strong and best logic skills what are the bes...

how to make basics strong and best logic skills what are the best way to be a expert programmer ? what counts a lot knowledge or practice?

Assignment, write a c program chat illustrates the creation of child proces...

write a c program chat illustrates the creation of child process using fork system call. One process finds sum of even series and other process finds sum of odd series.

About, How can I learn all programming languages.?

How can I learn all programming languages.?

Summations, How do you write the code for summations

How do you write the code for summations

I want skype recorder application, I want Skype Recorder Application + Setu...

I want Skype Recorder Application + Setup + Sourcecode + NICE UI Project Description: i want an application built which will allow user to record skype audio or video calls

Explain about inheritance, Inheritance and Reuse Consider a car manufac...

Inheritance and Reuse Consider a car manufacturing company. When they require building a new car, they have two choices. They can start from the scratch, or they can change an

Operation on list - c++ program, Operation on list - c++ program: Writ...

Operation on list - c++ program: Write a program in c to Insert value on list and list iteration. typedef struct item *node_ptr; struct item {                   int e

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd